"@@..."
And just as Xu Yun was imparting knowledge to Xiaoli.
Outside the main gate of the yard serving as a temporary classroom, there suddenly came a hurried knocking:
"Wang Lin! Wang Lin! Open the door quickly!"
Upon hearing this, Xu Yun instinctively exchanged a glance with Old Su, who was listening nearby.
Then he quickly walked to the gate and removed the latch.
As soon as the door opened.
He saw Old Jia standing outside with his hands behind his back and Sun Xiaochuan looking somewhat anxious.
Seeing this, Xu Yun hurriedly offered a junior's salute and said:
"Mr. Tongyu..."
But before he could finish his greeting, Old Jia grabbed him and said:
"Wang Lin, cosine, cosine, it's cosine!
The sum of several cosines can yield a value, roughly between one and a fourth and one and a third, correct?"
Old Jia's words seemed disjointed, unclear, almost as if he were rambling intoxicatedly.
